# OB 2024 vs ISOO 2024

The clearest difference is update cadence: ISOO 2024 at every 2 days against OB 2024's every 10 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OB 2024 ships an update every 10 months, ISOO 2024 every 2 days. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | OB 2024 | ISOO 2024 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 days** |
| Size | 28 MB | 36 MB |
| Requires iOS | **11.0** | 12.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [ACADEMIA OPHTHALMOLOGICA BELGICA](https://appshunter.io/developer/1406677516) | [Sai Goutham Murthy](https://appshunter.io/developer/1613921954) |

## What reviewers say

### OB 2024

[App page](https://appshunter.io/ios/app/ob-2024/id1406677517)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### ISOO 2024

[App page](https://appshunter.io/ios/app/isoo-2024/id6738309459)

**In-app purchases:** none


## Frequently asked questions

### Is OB 2024 free?

OB 2024 is free to download, with no in-app purchases.

### Is ISOO 2024 free?

ISOO 2024 is free to download, with no in-app purchases.

### Do OB 2024 or ISOO 2024 have ads?

Neither OB 2024 nor ISOO 2024 shows ads.

### Which is updated more often, OB 2024 or ISOO 2024?

OB 2024 ships an update every 10 months, and ISOO 2024 every 2 days. Most recently, OB 2024 was updated on November 2, 2026 and ISOO 2024 on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*